is:preprint lang:en COVID-19 antibodies antibody testing transmission reduced transmission behaviours TRBs NHS health beliefs blood sample antibody status knowledge of antibody status compliance engagement in TRBs

is:preprint lang:en protocol CHARIS CHARIS COVID-19 public health population health governments absence of vaccine behavioural change transmission reducing behaviours TRBs physical distancing hand washing face coverings mental health general health variations in adherence Scotland telephone surveys random digit dialing event-related changes decision-makers behaviourally-informed intervention